Portable boring machine



May ,27, 1930. J. J. BROSNAN PORTABLE BORING MACHINE Filed Jan. 10, 1929 3 Sheets-Sheet 1 Jim 7 a, JZ/as 170 17,

May 27, 1930. J. J. BROSNAN I PORTABLE BORING MACHINE Filed Jan. 10, 1929 3 Sheets-Sheet 2 May 27, 1930. v J. J. BRCSNAN PORTABLE BORING MACH I NE Filed Jan. 10, 19729 5 Sheets-Sheet 3 70.7)); ZZZ/0027a 77,

[WW I Patented May 27 1930 p l i I h UNITE s'rres JOHN J. BROSNAN, OF WORCESTER, MASSACHUSETTS PORTABLE B0311? G MACHINE Application filed January 10 1929. Serial No. 331,483.

This invention is an improvement over that Fig. 8 is asectional viewo f the casing on shown in my Patent No. 1,27 2,37 0, patented the line 8-8 of F1 '7 July 16, 1918. i Fig. 9 is a plan view of the nut looking in he principal ob ects of the present inventhed rection of the arrows 9, in Fig. 8; tron are to provide an improved form of de- F 1g. is a plan of the operating gear with E3 vice for the same general purposes as shown the key shown imposition; in that patent; to provide a construction in Fig. 11 is a plan showing the tool arranged which the handle for holding the device can with its axis horizontal, showing how the be turned to various angles so as to be able holding means operates when the device is set 10 to locate the operating shaft in any desired up between the two joists spaced apart; I 1) position when the machine is used up against Fig. 12 is a similar view showing the use of a wall or in a restricted space; to provide the other holding device which can be emmeans for supporting the device in several ployed when there is an opening through one different positions; to provide adjustable of the supporting members; supports at the tool end of the machine and Fig. 13 is a similar view showing the setalso at the other end, suiting it for being ting up of the device when the support is at adapted to function between a pair of joists an inclination, and v i or in a place where a hole has already been Fig. 1 is an elevation, partly in section, driven; to provide an adjustable base suitable showing the tool arranged without the frame 0 for supporting it either on a smooth surface and gears foroperating the tool simply by a '5 or on a rough board, in the latter case the supwrench. v port being perforated to allow spurs to pro- The invention involves several features ject into the wood; to provide an improved shown in my prior patentabove identified but nutfor the screw which is adapted to feed a mostly in a ditfe'rent form as will appear It boring tool into the work; to provide means also involves several additions included for 5'5 whereby the device can be set up againsta the purposes above mentioned. supporting surface which is not at right an- It will beiunderstood that the set upshown gles to the line of the boring tool and to proin Fig. 1 is only one way in which the inven-' vide a simple construction whichcan be used tion can he used, but it is the ordinary way,

without the frame for boring in a small space. and I will describe that first. so

Other objects and advantages of the in- In this form the invention involves a casing ti will appear hereinafter. made of two parts 10 and 11 secured together Reference is to be had tothe accompanying by screws. This casing is provided with an drawings in which 7 operating shaft 12 having two square heads,

3 Fig. 1 is a side elevation, partly in section, one on each end as shown in Fig. 7. A ratchet showing a preferred embodiment of the inwrench or spanner 13 can be placed on either vention and the ordinary use thereof; end and operatedin the ordinary way to op- Fig. 2 is a plan, partly in section, ofone of crate the tool; the holding plates in the upper. part of the On this shaft 12 is a spiral gear '14 operdevice; ating a spiral gear- '15 on a Vertical aXis'as Fig. 3 is a plan of the holding handle; shown in Fig. 8. In the center of. this gear Fig. 1 is a side view, partly in section, of is an opening or passage, through which pasthe supporting base, turned the other side up; sage the tool shank 16 passes. The shank is Fig. Sis a sectional view on the line 55 of provided with a pair of opposite key ways 17. 45 Fig. 1, showing the supporting base illus- Into these key ways extend keys 18'which are trated in that figure; held inside the gear and having flanges 19 Fig. 6 is a sideelevation taken in the direcat the top and bottom on opposite sides of the tionof the arrow 6 in Fig. 1; gear. A pair of washers 20 are located be- Fig. 7' isa plan of the casing with the parts hind these keys in the casing.

f5 cutaway to show the interior construction; It will be seen that,'on account of the pres- 10o ence of the keys, the screw-threaded shank 16 will be rotated with the gears and can be moved up or down freely in the casing. A nut is provided fixedly mounted on the casing as shown in Fig. 9. It consists of two halves 21 pivotally mounted on studs'22 on one side and held apart by a spring 23. A lug 24L on the casing keeps these parts in the proper position and has a threaded hole which supports a screw 25. The screw has a knurled head 26 and a conical internal surface 2'? that engages with the outside edges of a lug 28 one each half of the frame 21 in that plane.

The frame 21 carries two half nuts 28 held in by screws 29. It will be seen therefore that by manipulating the knurled head 26 the two halves can be separated to allow the screw to. be put in and taken out but when the head is screwed up the two half nuts will engage the screw to feed the shaft 16 up and down as it turns.

On the end of the shank a collar 32 is fixed in which the tool 33 is held. The frame is intended to be supported by a base This base is provided with four lugs 35 and 36. The lugs 35 are provided with countersunk perforations 37. Into these perforations extend spurs 38 on screw-threaded adjusting and supporting rods 39 when the device is set up in the manner shown in Figs. 1 and 6. The spurs extend into the wood of the surface onwhich the device is supported and as the ends of the screws 39 are formed to fit exactly the countersunk perforations 37 the base will be supported exactly at right angles to these screws and against the surface of the wood and the spurs will hold it against shifting so that it constitutes an effective base for the niachine.

This base 34 can be turned the other side up, as shown in F ig; 4i, and receive the spurs without allowing-themto enter the wood. This arrangement is used when the base engages a finished wood surface or anything that should not be marred in the operation.

The lugs 36 project the same distance from the base 35 as'the lugs 35 and in this case they constitute four feet for the base. The screws 7 P9 screw into lugs 40 integral with the half 11 of the casing.

The casing is held in any desired position angularly by an handle 41 having a circular end plate 42 provided with a series of perforations 43 arranged in a circle. The top l'neinber 10, of the casing has a pair of lugs at opposite each other adapted to enter two oppositeperforations a3. In this way the handle 41 can be located at so that the operator can change'th'e frame and change the positionof the support in accordance with the necessity, if the machine is located up against a wallor in arestricted plai A nut 45 is adapted'to be- 'screwed down on athreadedintegral lug as on the any desired angle top of the casing 10 to hold down the plate 1-2 constituting a part of the handle.

- Into the inside of the lug 46 is screwed an externally threaded adjusting sleeve 47 and this sleeve has a cylindrical passage through it for the upper end of the shank 16. On the upper end of this sleeve screws a cylindrical sleeve 50, having an angular portion 51 for the application of a wrench. The sleeve has an internal screw thread at the bottom for fitting the screw threaded sleeve Hand also has. an internal screw thread 52 at the top. This sleeve screws down on the sleeve a? for adj ustnient to any desired'point.

On this sleeve 50 fits a plate 59 having two spurs 53 which are provided with cotter pins and their position limited on one side by the cotter pins and on the other by integral collars 5 1 and it also has a third spur 55 which 7 is screw-threaded through the plate for adjustnient to bring it to a correct position.

The plate is shown as arranged-in the form of a triangle, each of these spurs being equally distant from the center and their purpose will be explained below.

Extending into the screw thread 52 is a plug 56 having spanner holes by which it can be turned and having screw threads at each end, thelower receiving th e'screw thread 52 and the upper receiving a screw thread in a circular hollow handle 57. This plug also has a spur 58 for use in engaging a surface and pressing the tool against it'when the iandle is not used. I Between the integral collar of this plug and the bottom of the handle is adapted to be supported another plate 59 made exactly like the other except that the opening through-it at the center is screw-threaded tolit the screw on the top of the plug 56. v The parts can conveniently be set up in full as shown in Fig. 1 but it'will be understood that in this figure the plates 59 are not being used because the machine is held by; the

handle 5? at the top. The casing is held from turning by the handle 41 and pressureis put on by the operator through the handle 57. It

is operated by the handle wrench 13 in an obvious manner.

Itit is desired to press the tool between two oists parallel to each other and both of soft wood the base 3 1 can be removed or not as desired and the spurs 38 forced into soft wood at oneside. The handle57 is removed and the spur 58 together withthe spurs on the upper plate 59 forced intothewood atthe other side by manipulation of the nut 51 for adjustment; The above is shown in Fig. 11.

VVith'the same setting atthe left hand end the right hand end can be setup. by the use of the other plate- 59 in a" case where the. support ison two studs separated from each other or there is a hole through the stud. In this case the plate 59 hearing against the shoulder of the nut 51 funnishes the spurs for engaging in the wood as shown in Fig. 12. The other parts of the device may extend through part way into the space between the studs.

In case one of the joists or other surfaces on which the tool is to be supported is angularly supported as in Fig.13, the screws 39 can be adjusted accordingly to set up the instrument in that way.

In Fig. ll I have shown another way' of setting up parts of this device to provide a very simple tool in which the wrench is placed on a shank of a screw 61 which is constructed to take the place of the shank 16. This screw, however, is not provided with any slots but is a complete screw and ext-ends into an internally and externally threaded screw 62 which fits in its turn in the sleeve 50, adjusted by the nut 51. in this case a knurled collar 63 is used to hold the adjustment and also either one of the plates 59 can be employed, one being shown with the handle 5'? but, of course, the other combinations as suggested can be used for this part also.

In this case the tool can be used by holding the handle 57 in the hand or employing the plate 59 as desired and the wrench l3 operates directly on what is the equivalent of the shank of the boring tool to rotate the latter and secure the desired result. simple way of setting up part of this tool where it is not possible to get the whole tool in but, of course, there is no multiplication of the power. It permits of the use of the tool to bore holes in places that cannot be conveniently bored by ordinary tools or by therethrough whereby, when the handle is the whole stand as shown in the other figures.

In place of the ratchet 13 the shaft 12 can be connected to a motor and the device operated by power. Also for highspeed opinns of places and its use is so universal that it would be used practically everywhere where it may be desired to do so. The replacements are of a simple character and can be applied by the ordinary workman and they are so constructed as to provide practically two tools, one much simpler than the other and by sacrificing the power, holes can bored by this tool also in restricted places. Although I have illustrated and described only one ei'nbodiinent of the invention I have shown various attachment-s applied thereto and 1 am aware o" the fact that modifications can be made therein and especially in the attachments without departing from the scope of the invention as expressed in the claims. Therefore, I do not Wish to be limited in this respect but what I do claim is 2- This is a" t-i011 the ratchet 13 can be applied to the 7 posted pos tion.

1. In a boring machine, thecombination of a casing, a gear therein having a key, a

screw-threaded shank "having a key way for said key passing through the center of the gear, a pair of pivoted frames on sa d casin each havin a half nut for en a 'i'n b/ D O t) 0 "he screwthreaded part of said shank, a lug on the cas1ng,'a screw having a knurled head and 'a conical interior surface carried by said lug, the two members of said nut frame having' pro ections adapted to be engaged by said conical surface for forcing the nut frames together and a spring for normally forcing them apart.

2. Ina boring machine, the combination.

with a casing, a shank for holding the boring tool, and screws adj ustably mounted and having spurs on the ends for engaging in a surface on which the casing is to be supported,

ofa base having two sets of lugs thereon, one

set having perforations fitting the ends I of said screws but allowing the spurs to pass through the base, said perforations, -when the base is held the other sine up,-preventing the spurs from passing into the wood and the other set of lugs engaging the surface against which the tool is to be pressed. a 3. In a boring tool, the combinationwith a casing, means for adjustably holding the easing at one end in position, a screw-threaded shank extending through the casing, means for turning the shank and feeding it forward, and means for holdingthe-boring tool on theend ofthe shank, said casing having an integral lug thereon, of a handle having a plate in line therewith havingperforations turned, the lugwill extend into one'of said perforations to provide for adjustment of the handle angularly and a nut screwingdown on the plate to hold thehandle in ad 4. In a boring maohine, the combination with a shank having means for supportinga boring tool at one enc,-means.for supportinging the shank, said shank being screw-thread ed, a sleeve above the shank concentric there: with and having an external screw thread, an internally screw-threaded sleeve having an angular portion on the end for adjusting it fitting said screw thread, a plug screwing" into the end of the last named sleeve and a spur supported by said plug for steadying the tool.

6. In a boring tool, the combination with a casing and means for supporting it at one},

end, of a screw-threaded shank extending through the casing for holding the boring tool, a screw-threaded sleeve supported by the shank and extending in the opposite direction therefrom, an internally screwthreaded sleeve adj ustably mounted thereon and having a screw thread in its upper end,

a plug fitting the larger internal screw thread and projecting above it, and a plate supported by said lug and having spurs projecting up from its corners, said plug also having a spur for use in supporting this end of the boring tool.

7. In a boring tool, the combination with a casing and means for supporting itat'one end, of a screw-threaded shank extending,

through the casing for holding the boring tool, a sleeve supported by the shank and extending inthe opposite direction therefrom,

a sleeve adjustably mounted thereon and having a screw thread in its-upper end, a plug fitting the larger screw thread and project- 7 ing above it and a hollow handle above said plug for use in supporting this end'of the boring machine. 7

8. As an article of manufacture, a brace plate for a boring machine having at the I corners thereof, a series of spurs, one of Which i is adjustable for engaging the surface against which thetool is to-be braced, the other spurs being readily movable but having means to prevent their being removed accidentally from the plate. I

9. The combination in a boring machine of a casing having an integral lug thereon and carrying a boring tool shank, With a handle having a plate provided With a circular series of perforations therearound, each one for engaging said lug, whereby the plate can be supported to extend at any angle from the machine and means for holding the plate down on the casing after adjustment.

aifixed my signature.

In testimony whereof I have hereunto JOHN J. BROSNAN. 

